The birthplace of our Chinese civilization is mainly in the Yellow River Basin, and the Yellow River is our "mother river"."The Yellow River fights water, and the mud is the seventh".said.
Then the question arises,After so much sediment flows into the sea, it all goes to **Won't the sediment accumulate over the years and cause the sea level to rise?In fact, there has been an answer to this question for a long time.
In our dazzling Chinese civilization, the status of the Yellow River cannot be ignored, and the origin of many civilizations is near the river, and the origin of our Chinese civilization is in this Yellow River.
In the existing records, the Yellow River has existed for thousands of yearsMore than 1000 timesoverflow, and there are major diversions26 times, the "temper" of the Yellow River's mother is uncertainAlthough it has brought endless benefits to the people living near the Yellow River Basin, it has also brought disasters at times.
In ancient books recorded the Yellow RiverThe first major diversion was during the Spring and Autumn periodThis time the Yellow River crossed the North China Plain directly, and the river eventually flowed into the Bohai Sea, but this diversion did not bring much disaster to the people nearby, and after that, the Yellow River stabilized for more than 400 years.
The second major diversion is a little controversial, some say that it was the third year of Emperor Yuanguang of the Han Dynasty, and some say that it was the period of Wang Mang, but it is more the diversion of the Wang Mang period, which originally flowed into the ocean to the northeastThe sudden diversion to the southeast severely hindered Wang Mang's reforms, which indirectly accelerated the fall of Wang Mang's dynasty.
Later, during the reign of Emperor Renzong of the Northern Song Dynasty, the Yellow River was once again diverted to the northeast, passing through the Wei River, and flowing into the sea from Tianjin.
Since then, the Yellow River has been diverted many timesBut the last diversion in modern times was artificialIn 1938, Chiang Kai-shek, in order to block the Japanese army, ordered the troops to break throughThe Yellow River embankment at the mouth of the garden in ZhengzhouFor a time, the floods were all over the country, and the people were struggling to make a living, which not only did not achieve the strategic goal, but also caused floods.
The sediment content of the Yellow River has been much reduced compared to before, thanks to conservation measures, the creation of many reservoirs, and other measures to conserve water and soil.
Although the sediment content has been reduced, the overall content is still very large, but the distribution of sediment is not uniform, but there are time differencesIn addition to the difference between the wet season and the dry season, there is also the difference between the flood season and the non-flood season in each year.
The time period given by experts who study the Yellow River is not much different, and the closest time to us isThe period from 2005 to 2012 was a wet period, and the dry period from 1991 to 2004 was a dry period.
During the year, the flood season is mainly concentrated in the summer, between July and October, when the Yellow River has more sediment, but during the non-flood season, more than 80% of the Yellow River is clear, which is really counterintuitive.
The Yellow River passes through the Loess Plateau, bringing a large amount of sediment, which pours into the sea with the river, but this sediment eventually goes to the **?
According to relevant data, the Yellow River will take about 1.6 billion tons of sediment from the Loess Plateau every year, but about 400 million tons of sediment will not flow into the sea
In order to improve the water flow environment of the Yellow River, we have made a lot of efforts to plant trees on the Loess Plateau, and before 1999, the vegetation coverage of the Loess Plateau was onlyBy 20 years later, the vegetation cover of the Loess Plateau had doubled to reachThis shows how much attention we attach to the management of the Yellow River.
We know that the sediment content of the Yellow River has become smaller, thanks to sand control measures, but what about the sediment that has flowed into the sea?
It all started in 1912 by the German meteorologist Wegener"Continental Drift Doctrine".When Wegener was looking at the world map, he stumbled upon the contours of the continental platesHe studied paleontology, rocks, and other things on different continents, and then came up with the "theory of continental drift".
This theory was not taken seriously at first, but was considered too absurd, and it was not until later that it was slowly accepted, and the Himalayas and the Great Rift Valley were the products of continental drift, which gradually won public acceptance with the development of science and technology and the accumulation of evidence.
On this basis, there is another one"The Doctrine of Seafloor Expansion".In this theory, mantle material gushes out of a huge crack at the top of a ridge and solidifies to form a new oceanic crust.
It is believed that there are mountains at the bottom of every ocean, and when these "ocean mountains" meet the crust of the continent, they will sink into the mantle of the continental crust and slowly disappear, and the sediment carried by the Yellow River will flow into the oceanSome of them are deposited in the lower plains, while others sink into the ocean floor and participate in the movement between the plates.
After the sediment flows into the ocean, it will affect the local hydrological environment, and will indirectly affect the seawater in terms of salinity, temperature, etc., and the seawater will become turbidHowever, for the animals and plants on the seabed, it provides the soil for survival and brings different nutrients.
Our Chinese nation is well versed in the golden mean, everything pays attention to a balance, too much, the same is true of the sediment into the sea, although the sediment can bring benefits to a certain extent, but in most casesThe impact of sediment on the marine hydrological environment is negative.
Too much sediment into the ocean will cause the plankton on the bottom of the sea to be unbalanced, and some harmful substances will affect the surrounding marine ecosystem, and if the marine ecosystem is destroyed, it is likely to trigger the butterfly effectIt has a negative effect on some other marine life.
Therefore, the management of sediment into the sea is necessary, which not only affects the life of the seabed, but also affects the economic activities of human beings, and can strengthen the management of the coastlineReduce the sediment content of rivers, thereby stabilizing the ecological environment of the seabed and promoting the sustainable development of people and nature.
The area of natural wetlands in the Yellow River Delta is decreasing, while the area of artificial wetlands is increasing, and the ecosystem is becoming more and more fragile.
Although it seems far away from our lives, the management of the Yellow River is actually closely related to our lives, and the relationship between man and nature is very delicateIn the past, people tried to use nature for more economic benefits, but in the end, they were counterattacked.
Nowadays, we know that we must respect nature and live in harmony with nature, whether it is engaged in industrial sound field activities or other activities, we must protect the natural environment and achieve harmonious coexistence between man and nature, so as to achieve sustainable development.
The concept of harmonious coexistence between man and nature has been deeply rooted in the hearts of the people, how to properly handle the relationship between man and nature is an eternal topic, on this road, we have been groping, to avoid excessive deforestation, but a large area of afforestation, improve the vegetation coverage, to restore the original environment of nature to the greatest extent, so as not to be swallowed by nature.
There was a time when we felt that human beings were higher animals, even better than nature, and we despised nature, and finally were eaten up by some natural disasters, and then we felt that human beings were part of the natural world, and began to be in awe of nature, and the resources on the earth are limited and cannot be wasted at will.
As long as we actively participate in the action of protecting nature, attach importance to nature and protect nature, can we achieve the harmonious coexistence of man and nature, can we achieve green sustainable development, and can we leave a safe and beautiful environment for future generationsIf our generation makes changes, our future generations will face a problem.
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